https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95942
Bug ID: 95942
Summary: [11 regression] offsetof on an array: error: 'e' is
not a constant expression
Product: gcc
Version: 10.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at inbox dot ru
Target Milestone: ---
The original error is seen on https://www.dolphin-emu.org/ project as a build
error. Minimized example looks the following:
"""
// $ cat.bug.cc
struct a {
int b;
char c[100];
};
unsigned long d(long e) { return __builtin_offsetof(a, c[e]); }
"""
OK:
$ LANG=C g++-10.1.0 -c bug.cc -o bug.o
OK:
$ LANG=C clang++-10 -c bug.cc -o bug.o
FAIL:
$ LANG=C g++-11.0.0 -c bug.cc -o bug.o
bug.cc: In function 'void d(long int)':
bug.cc:8:42: error: 'e' is not a constant expression
8 | void d(long e) { __builtin_offsetof(a, c[e]); }
|
Who is wrong here? gcc-10 or gcc-11?
